Title :
The magnetic properties of magnetic nanoparticles produced by microwave flash synthesis of ferrous alcoholic solutions
Author :
Niepce, J.C. ; Stuerga, D. ; Caillot, T. ; Clerk, J.P. ; Granovsky, A. ; Inoue, M. ; Perov, N. ; Pourroy, G. ; Radkovskaya, A.
Author_Institution :
Lab. de Recherche sur la Reactivitedes Solides, Bourgogne Univ., Dijon, France
fDate :
9/1/2002 12:00:00 AM
Abstract :
Microwave heating is an emerging technology that uses the ability of some liquids and solids to transform electromagnetic energy into heat. We present the results of experimental study of magnetic and structural properties of magnetic nanoparticles fabricated by this technique. Compared with similar nanoparticles fabricated by using a conventional heating, we obtained much smaller grain size (up to 10 nm) and very stable magnetic properties. The hysteresis loops for the samples of the nonoriented assemblies of magnetite particles have a coercive force about 100 Oe with a squareness about 0.4. The superparamagnetic fraction was found in the samples. The particles distribution on the anisotropy fields has a maximum at 200 Oe.
Keywords :
X-ray chemical analysis; X-ray diffraction; coercive force; ferrimagnetic materials; iron compounds; magnetic anisotropy; magnetic hysteresis; magnetic particles; microwave heating; nanostructured materials; powder technology; remanence; transmission electron microscopy; 10 nm; Fe3O4; X-ray diffraction; anisotropy field; coercive force; energy-dispersive X-ray analysis; ferrous alcoholic solutions; hysteresis loops; magnetic nanoparticles; magnetic properties; magnetite particles; microwave flash synthesis; microwave heating; remanence; structural properties; superparamagnetic fraction; transmission electron microscopy; Alcoholism; Electromagnetic heating; Grain size; Magnetic anisotropy; Magnetic hysteresis; Magnetic properties; Microwave technology; Nanoparticles; Perpendicular magnetic anisotropy; Solids;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.801963
